ocamldoc/Makefile.nt seems not to be up-to-date compared with ocamldoc/Makefile. It builds odoc_info.cma and odoc_info.cmxa with objects outside of ocamldoc, for example, typing/ident.cm{o,x}. This prevents from linking odoc_info.cm{a,xa} and compierlibs altogether in "NT" environment, since the both implements module Ident.